title: Teleocidin, lyngbyatoxin A and their hydrogenated derivatives, possible tumor promoters, induce terminal differentiation in HL-60 cells.
abstract: Teleocidin isolated from Streptomyces mediocidicus, its catalytically hydrogenated compound dihydroteleocidin B, and lyngbyatoxin A isolated from marine blue-green alga Lyngbya majuscula as well as its hydrogenated product, tetrahydrolyngbyatoxin A were tested for their ability to induce differentiation of human promyelocytic leukemia cells (HL-60 cells) in culture. All of these indole alkaloids induced differentiation of HL-60 cells, characterized by increased phagocytosis, increased release of lysozyme, and morphological changes resembling macrophages. The concentrations required for the induction were 1-5 ng/ml, showing similarity to those of 12-O-tetradecanoylphorbol-13-acetate (TPA). Teleocidin, lyngbyatoxin A, and tetrahydrolyngbyatoxin A are suggested to be tumor promoters, like TPA and dihydroteleocidin B. The HL-60 cell system might be useful for screening for environmental tumor promoters.
mesh_terms: D000470:Alkaloids / Q000633:toxicity*; D002273:Carcinogens / Q000633:toxicity*; D002471:Cell Transformation, Neoplastic / Q000187:drug effects*; D003885:Dermotoxins / Q000633:toxicity*; D006801:Humans; D015470:Leukemia, Myeloid, Acute / Q000473:pathology*; D008235:Lyngbya Toxins
chemical_list: D000470:Alkaloids; D002273:Carcinogens; D003885:Dermotoxins; D008235:Lyngbya Toxins; C022176:teleocidins; C022229:dihydroteleocidin B; C019457:lyngbyatoxin A